Add ha interface

.gitignore

@@ -2,3 +2,5 @@ build
 layers
 .tox
 interfaces
+builds
+deps

Makefile

@@ -1,8 +1,9 @@
 #!/usr/bin/make
 LAYER_PATH := layers
+INTERFACE_PATH := interfaces
 
 clean:
 	rm -Rf build
 
 generate: clean
-	LAYER_PATH=$(LAYER_PATH) tox -e generate
+	LAYER_PATH=$(LAYER_PATH) INTERFACE_PATH=$(INTERFACE_PATH) tox -e generate

charm/config.yaml

@@ -23,3 +23,23 @@ options:
     default: 'email@example.com'
     type: string
     description: Email address of the person responsible for the domain.
+  vip:
+    type: string
+    default:
+    description: |
+      Virtual IP(s) to use to front API services in HA configuration.
+
+      If multiple networks are being used, a VIP should be provided for each
+      network, separated by spaces.
+  vip_iface:
+    type: string
+    default: eth0
+    description: |
+      Default network interface to use for HA vip when it cannot be
+      automatically determined.
+  vip_cidr:
+    type: int
+    default: 24
+    description: |
+      Default CIDR netmask to use for HA vip when it cannot be automatically
+      determined.

charm/layer.yaml

@@ -1 +1 @@
-includes: ['layer:openstack-api', 'interface:bind-rndc']
+includes: ['layer:openstack-api', 'interface:bind-rndc', 'interface:hacluster']

charm/metadata.yaml

@@ -21,3 +21,6 @@ provides:
 requires:
   dns-backend:
     interface: bind-rndc
+  ha:
+    interface: hacluster
+    scope: container

charm/reactive/designate_handlers.py

@@ -1,10 +1,14 @@
-from charmhelpers.core.hookenv import unit_private_ip
+from charmhelpers.core.hookenv import unit_private_ip, config
 from charms.reactive import (
     hook,
     when,
 )
 from charm.openstack.designate import DesignateCharmFactory
+import ipaddress
 
+from relations.hacluster.common import CRM
+from relations.hacluster.common import ResourceDescriptor
+from charm.openstack.charm import VirtualIP
 
 @hook('install')
 def install_packages():
@@ -51,3 +55,12 @@ def render_stuff(amqp_interface, identity_interface, db_interface,
     charm.db_sync()
     charm.create_domains()
     charm.render_full_config()
+
+@when('ha.connected')
+def cluster_connected(hacluster):
+    user_config = config()
+    resources = CRM()
+    resources.add(VirtualIP(user_config['vip']))
+
+    hacluster.bind_on(iface=user_config['vip_iface'], mcastport=4440)
+    hacluster.manage_resources(resources)

tox.ini

@@ -18,7 +18,7 @@ deps =
 [testenv:generate]
 basepython = python2.7
 commands =
-    charm generate --log-level DEBUG -o {toxinidir}/build charm
+    charm build --log-level DEBUG -o {toxinidir}/build charm
 
 [testenv:venv]
 commands = {posargs}